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Fair value measurements (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of valuation methodology for assets and liabilities at fair value

The following section describes the valuation methodology used to measure our financial assets and liabilities that were accounted for at fair value and are categorized based on the fair value hierarchy described in Accounting Standards Codification ("ASC") 820, "Fair Value Measurements and Disclosures."

Overview of Century’s valuation methodology
	Level	Significant inputs
Cash equivalents	1	Quoted market prices
Trust assets (1)	1	Quoted market prices
Surety bonds	1	Quoted market prices
Forward financial sales	2	Quoted market prices
Fixed for floating swaps	3	Quoted market prices, management's estimates of future U.S. Midwest premium
E.ON contingent obligation	3	Quoted market prices, management’s estimates of the LME forward market prices for periods beyond the quoted periods and management’s estimate of future level of operations

(1) Trust assets are currently invested in money market funds. These trust assets are held to fund the non-qualified supplemental executive pension benefit obligations for certain of our officers. The trust has sole authority to invest the funds in secure interest producing investments consisting of short-term securities issued or guaranteed by the United States government or cash and cash equivalents.

Financial assets and liabilities at fair value on a recurring basis

The following table sets forth our financial assets and liabilities that were accounted for at fair value on a recurring basis by the level of input within the ASC 820 fair value hierarchy.

Recurring Fair Value Measurements	As of June 30, 2017
	Level 1				Level 2				Level 3				Total
ASSETS:
Cash equivalents	$	82,567			$	—			$	—			$	82,567
Trust assets	2,703				—				—				2,703
Surety bonds	1,625				—				—				1,625
Derivatives	—				—				354				354
TOTAL	$	86,895			$	—			$	354			$	87,249
LIABILITIES:
E.ON contingent obligation - net	$	—			$	—			$	—			$	—
Derivatives	—				7,208				331				7,539
TOTAL	$	—			$	7,208			$	331			$	7,539

Recurring Fair Value Measurements	As of December 31, 2016
	Level 1				Level 2				Level 3				Total
ASSETS:
Cash equivalents	$	79,014			$	—			$	—			$	79,014
Trust assets	3,147				—				—				3,147
Surety bonds	1,874				—				—				1,874
Derivatives	—				—				925				925
TOTAL	$	84,035			$	—			$	925			$	84,960
LIABILITIES:
E.ON contingent obligation – net	$	—			$	—			$	—			$	—
Derivatives	—				—				253				253
TOTAL	$	—			$	—			$	253			$	253

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- Definition

Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- References

No definition available.

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- Definition

Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

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